ng pic- France, is a combination of a boat wholly submerged with a form, says the author of this article, Mr. P. H. Morse, in the ture frame and mirror backs. One of the principal claims raft: a connecting link, to borrow the naturalist's expression, Northwestern Lumberman, it may not be out of… … some respects from those of the Woolwich Prom the plunger, A, rise two hollow col- mechanics. umns, E, to which metallic plates, F, are at- Fig. l.-TOMMASI'S HEMI-PLUNGER. In 1779 he was ordered by the government tached to diminish friction through the water. to examine into the progress of…
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